WO2019230771A1 - Bandage pneumatique - Google Patents

Bandage pneumatique Download PDF

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Publication number
WO2019230771A1
WO2019230771A1 PCT/JP2019/021236 JP2019021236W WO2019230771A1 WO 2019230771 A1 WO2019230771 A1 WO 2019230771A1 JP 2019021236 W JP2019021236 W JP 2019021236W WO 2019230771 A1 WO2019230771 A1 WO 2019230771A1
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WO
WIPO (PCT)
Prior art keywords
annular
resin
tire
end surface
axial direction
Prior art date
Application number
PCT/JP2019/021236
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English (en)
Japanese (ja)
Inventor
福島　敦
Original Assignee
株式会社ブリヂストン
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Filing date
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Application filed by 株式会社ブリヂストン filed Critical 株式会社ブリヂストン
Publication of WO2019230771A1 publication Critical patent/WO2019230771A1/fr

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    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B60—VEHICLES IN GENERAL
    • B60C—VEHICLE TYRES; TYRE INFLATION; TYRE CHANGING; CONNECTING VALVES TO INFLATABLE ELASTIC BODIES IN GENERAL; DEVICES OR ARRANGEMENTS RELATED TO TYRES
    • B60C1/00—Tyres characterised by the chemical composition or the physical arrangement or mixture of the composition
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B60—VEHICLES IN GENERAL
    • B60C—VEHICLE TYRES; TYRE INFLATION; TYRE CHANGING; CONNECTING VALVES TO INFLATABLE ELASTIC BODIES IN GENERAL; DEVICES OR ARRANGEMENTS RELATED TO TYRES
    • B60C5/00—Inflatable pneumatic tyres or inner tubes
    • B60C5/01—Inflatable pneumatic tyres or inner tubes without substantial cord reinforcement, e.g. cordless tyres, cast tyres
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B60—VEHICLES IN GENERAL
    • B60C—VEHICLE TYRES; TYRE INFLATION; TYRE CHANGING; CONNECTING VALVES TO INFLATABLE ELASTIC BODIES IN GENERAL; DEVICES OR ARRANGEMENTS RELATED TO TYRES
    • B60C9/00—Reinforcements or ply arrangement of pneumatic tyres
    • B60C9/18—Structure or arrangement of belts or breakers, crown-reinforcing or cushioning layers
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B60—VEHICLES IN GENERAL
    • B60C—VEHICLE TYRES; TYRE INFLATION; TYRE CHANGING; CONNECTING VALVES TO INFLATABLE ELASTIC BODIES IN GENERAL; DEVICES OR ARRANGEMENTS RELATED TO TYRES
    • B60C9/00—Reinforcements or ply arrangement of pneumatic tyres
    • B60C9/18—Structure or arrangement of belts or breakers, crown-reinforcing or cushioning layers
    • B60C9/20—Structure or arrangement of belts or breakers, crown-reinforcing or cushioning layers built-up from rubberised plies each having all cords arranged substantially parallel

Definitions

  • the present invention relates to a pneumatic tire.
  • an inclined belt including a metal cord inclined with respect to the tire circumferential direction on the outer side in the tire radial direction of the carcass disposed across the bead portions, and a circumference including a metal cord extending along the tire circumferential direction.
  • a pneumatic tire in which a belt including a directional belt is disposed.
  • Patent Document 1 discloses a carcass, an active reinforcing material composed of a single layer of reinforcing elements inclined by 4 ° to 7 ° with respect to the tire circumferential direction, and a flat surface positioned in the central portion of the crown of the carcass.
  • a tire comprising a crown reinforcement comprising a circumferential polymer reinforcement element is disclosed.
  • the weight of the tire can be reduced by using a part of the belt layer including the cord as a flat circumferential polymer reinforcing element as a resin annular body.
  • the tire disclosed in Patent Document 1 still has room for improvement in terms of durability and productivity.
  • an object of the present invention is to provide a pneumatic tire including a resin annular body that can improve durability and productivity.
  • the pneumatic tire as the first aspect of the present invention includes an annular end surface on one side in the tire axial direction of the resin-made first annular portion and an annular end surface on the other side in the tire axial direction of the resin-made second annular portion.
  • the annular end surface of the first annular portion and the annular end surface of the second annular portion of the resin annular body are arranged so that at least a part thereof overlaps in the tire radial direction.
  • a pneumatic tire according to a second aspect of the present invention includes a resin annular body formed by joining one end surface and the other end surface in the longitudinal direction of a resin strip, and the resin annular body.
  • FIG. 1 is a cross-sectional view of a pneumatic tire as an embodiment of the present invention in a cross section parallel to a tire axial direction including a tire center axis. It is a perspective view which shows the resin annular body shown in FIG. It is sectional drawing which shows the tire axial direction cross section of the resin annular body shown in FIG. It is the expanded sectional view which expanded a part of FIG. It is a figure which shows the modification of the cyclic
  • “applicable rim” is an industrial standard that is effective in the area where pneumatic tires are produced and used.
  • JATMA Joint Automobile Tire Association
  • JATMA YEAR BOOK JATMA YEAR BOOK
  • ETRTO European STANDARDS MANUAL of TIRE and RIM Technical Organization
  • STANDARDS of ETRATO STANDARDS in the applicable size described in YEAR BOOK etc.
  • TRA The Tire and Rim Association, Inc.
  • Applied Rim refers to future sizes in addition to the current size
  • Sizes to be described in the future include the sizes described as “FUTURE DEVELOPMENTS” in the ETRTO 2013 edition).
  • a size not described in the industry standard it means a rim having a width corresponding to the bead width of the pneumatic tire.
  • the “specified internal pressure” refers to the air pressure (maximum air pressure) corresponding to the maximum load capacity of a single wheel in the applicable size / ply rating described in the above JATMA YEAR BOOK, etc. In the case of no size, the air pressure (maximum air pressure) corresponding to the maximum load capacity defined for each vehicle on which the tire is mounted is assumed. In addition, the “maximum load load” described later is defined for each vehicle on which a tire is mounted in the case of a tire maximum load capacity of the standard of JATMA or the like in the tire of an applicable size, or in the case of a size not described in the industrial standard. It means the load corresponding to the maximum load capacity.
  • FIG. 1 is a view showing a pneumatic tire 1 (hereinafter simply referred to as “tire 1”) as the present embodiment.
  • FIG. 1 is a cross-sectional view of the tire 1 in a cross section parallel to the tire axial direction A including the tire center axis O (the same direction as the tire width direction).
  • this cross section is referred to as “tire axial direction cross section”. Since the tire 1 shown in FIG. 1 has a symmetric configuration with respect to the tire equator plane CL, only one side in the tire axial direction A is shown, but the configuration is asymmetric with respect to the tire equator plane CL. You can also.
  • the tire 1 includes a tread portion 1a, a pair of sidewall portions 1b extending from both ends of the tread portion 1a in the tire axial direction A to the inside in the tire radial direction B, and each sidewall portion 1b. And a pair of bead portions 1c provided at the inner end in the tire radial direction B.
  • the tire 1 of this embodiment is a tubeless type radial tire for a passenger car.
  • the “tread portion 1a” means a portion sandwiched between the tread ends TE on both sides in the tire axial direction A.
  • the “bead portion 1 c” means a portion where a bead member 3 described later is located in the tire radial direction B.
  • the “sidewall portion 1b” means a portion between the tread portion 1a and the bead portion 1c.
  • the “tread end TE” means a position on the outermost side in the tire axial direction of the ground contact surface in a state where the tire is mounted on the above-described applied rim, the above-mentioned specified internal pressure is filled, and a maximum load is applied. .
  • the tire 1 includes a bead member 3, a carcass 4, a resin annular body 5, a belt 6, a tread rubber 7, a side rubber 8, and an inner liner 9.
  • the bead member 3 is embedded in the bead portion 1c.
  • the bead member 3 includes a bead core 3a and a rubber bead filler 3b positioned on the outer side in the tire radial direction B with respect to the bead core 3a.
  • the bead core 3a includes a plurality of bead wires that are covered with rubber.
  • the bead wire is formed of a steel cord.
  • the steel cord can be made of, for example, steel monofilament or stranded wire.
  • the carcass 4 extends between the pair of bead portions 1c, more specifically between the bead cores 3a of the pair of bead members 3, and extends in a toroidal shape.
  • the carcass 4 has at least a radial structure.
  • the carcass 4 includes one or more carcass plies 4a in which carcass cords are arranged at an angle of, for example, 75 ° to 90 ° with respect to the tire circumferential direction C (see FIG. 1 and the like).
  • the carcass ply 4a includes a ply body portion positioned between the pair of bead cores 3a, and a ply folding portion that is folded from the inside to the outside in the tire axial direction A around the bead core 3a at both ends of the ply body portion.
  • a bead filler 3b extending from the bead core 3a to the outer side in the tire radial direction B is disposed between the ply main body portion and the ply folded portion.
  • the carcass cord constituting the carcass ply 4a a polyester cord is adopted in this embodiment, but other than this, an organic fiber cord such as nylon, rayon, aramid, or a metal cord such as steel is adopted as necessary. Also good. Also, the number of carcass plies 4a may be two or more.
  • FIG. 2 is a perspective view showing the resin annular body 5 shown in FIG.
  • FIG. 3 is a cross-sectional view showing a cross section in the tire axial direction of the resin annular body 5.
  • FIG. 4 is an enlarged cross-sectional view in which a part of FIG. 3 is enlarged.
  • the resin annular body 5 is located on the outer side in the tire radial direction B of the crown portion of the carcass 4 in the tread portion 1a. Further, unlike the belt 6 described later, the resin annular body 5 does not include a cord. That is, no cord is arranged in the resin annular body 5.
  • the resin annular body 5 is formed by joining a resin-made first annular portion 5a and a resin-made second annular portion 5b. Specifically, as shown in FIGS. 3 and 4, the annular end surface 11 on the one side in the tire axial direction A of the first annular portion 5 a and the annular end surface 12 on the other side in the tire axial direction A of the second annular portion 5 b. And are joined.
  • the annular end surface 11 of the first annular portion 5 a of the resin annular body 5 and the annular end surface 12 of the second annular portion 5 b are arranged so that at least a part thereof overlaps with the tire radial direction B. And are joined in this state.
  • the entire region of the annular end surface 11 of the first annular portion 5a and the entire region of the annular end surface 12 of the second annular portion 5b of the present embodiment are arranged so as to overlap with the tire axial direction A. It is joined.
  • annular part 5a of this embodiment is joined by welding with respect to the cyclic
  • the inner end edge 11 a in the tire radial direction B of the annular end surface 11 of the first annular portion 5 a of the resin annular body 5 corresponds to the second annular portion 5 b of the resin annular body 5.
  • the annular end surface 12 is located on the inner side in the tire radial direction B than the outer end edge 12b in the tire radial direction B.
  • the outer end edge 11 b in the tire radial direction B of the annular end surface 11 of the first annular portion 5 a of the resin annular body 5 is formed on the annular end surface 12 of the second annular portion 5 b of the resin annular body 5. It is located outside the inner end edge 12a in the tire radial direction B in the tire radial direction B.
  • the thickness of the resin annular body 5 in the tire radial direction B at the joint portion of the first annular portion 5a and the second annular portion 5b of the resin annular body 5 is suppressed and becomes a joint surface.
  • the annular end surface 11 of the first annular portion 5a and the annular end surface 12 of the second annular portion 5b can be secured large. Therefore, the joint strength between the first annular portion 5a and the second annular portion 5b can be increased.
  • the above-described joint portion or It can suppress that stress concentration generate
  • the resin annular body 5 is formed by joining the annular end surface 11 of the first annular portion 5a and the annular end surface 12 of the second annular portion 5b, so that the resin of this embodiment can be obtained. Even if it is the structure which has the diameter reduction parts 13 and 14 (refer FIG. 3) in the both ends of the tire axial direction A like the annular body 5, the core metal mold
  • the tire 1 with improved durability and productivity can be realized by using the resin annular body 5 of the present embodiment.
  • the resin constituting the resin annular body 5 for example, a thermoplastic elastomer or a thermoplastic resin can be used, and a resin that is cross-linked by heat or an electron beam or a resin that is cured by thermal rearrangement can also be used.
  • the resin constituting the resin annular body 5 does not include rubber (an organic polymer substance exhibiting rubber elasticity at room temperature).
  • thermoplastic elastomers polyolefin-based thermoplastic elastomer (TPO), polystyrene-based thermoplastic elastomer (TPS), polyamide-based thermoplastic elastomer (TPA), polyurethane-based thermoplastic elastomer (TPU), polyester-based thermoplastic elastomer (TPC) And dynamic crosslinkable thermoplastic elastomer (TPV).
  • TPO polyolefin-based thermoplastic elastomer
  • TPS polystyrene-based thermoplastic elastomer
  • TPA polyamide-based thermoplastic elastomer
  • TPU polyurethane-based thermoplastic elastomer
  • TPC polyester-based thermoplastic elastomer
  • TPV dynamic crosslinkable thermoplastic elastomer
  • thermoplastic resin include polyurethane resin, polyolefin resin, vinyl chloride resin, polyamide resin and the like.
  • the deflection temperature under load (at the time of 0.45 MPa load) specified in ISO75-2 or ASTM D648 is 78 ° C or more, and the tensile yield strength specified in JIS K7113 is used.
  • a material having a tensile breaking elongation of 50% or more as defined in JIS K7113 and a Vicat softening temperature (Method A) as defined in JIS K7206 of 130 ° C. or more can be used.
  • the annular end surface 11 and the annular end surface 12 are arranged not only in the tire radial direction B but also in the thickness direction of the resin annular body 5.
  • the thickness direction of the resin annular body 5 is a direction orthogonal to a tangent to the inner surface of the resin annular body 5 on the tire inner surface side in a tire axial direction sectional view (see FIG. 1) which is a sectional view along the tire axial direction A. Means.
  • the belt 6 includes a cord disposed on the outer side in the tire radial direction B of the resin annular body 5 in the tread portion 1a and covered with rubber or resin.
  • the belt 6 of the present embodiment includes one or more belt layers (one layer in the present embodiment) disposed on the outer side in the tire radial direction B with respect to the crown portion of the carcass 4. More specifically, as shown in FIG. 1, the belt 6 of the present embodiment is constituted by a circumferential belt 6 a composed of only one circumferential belt layer.
  • the circumferential belt 6a as the belt 6 of the present embodiment is a steel cord as a metal belt cord of 10 ° or less, preferably 5 ° or less, more preferably 2 with respect to the tire circumferential direction C (see FIG. 1 and the like). This is a spiral belt formed by spirally winding around the tire center axis O at an angle of less than or equal to 0 °. More specifically, the circumferential belt 6a as the belt 6 of the present embodiment is a rubber-coated belt formed by a rubber-coated cord made of a cord 10b such as a steel cord covered with a coated rubber 10a.
  • the circumferential belt 6a as the belt 6 is spirally wound around the outer surface of the resin annular body 5 across the reduced diameter portions 13 and 14 at both ends in the tire axial direction A of the resin annular body 5. It is comprised by the rubber-coated code
  • the rubber-coated cord is wound around the outer surface of the resin annular body 5 in the tire radial direction B while being joined to the outer surface of the resin annular body 5 in the tire radial direction B.
  • the rubber-coated cord and the resin annular body 5 are joined by welding the covering rubber 10 a of the rubber-coated cord and the resin annular body 5.
  • the covering rubber 10a of the rubber covering cord and the resin annular body 5 are not limited to welding, and may be joined by bonding with an adhesive or the like.
  • the rubber-coated cords are joined at adjacent portions in the tire axial direction A.
  • the portions of the rubber-coated cord that are adjacent to each other in the tire axial direction A are joined together by welding the coated rubber 10a.
  • the portions of the rubber-coated cord adjacent to each other in the tire axial direction A are not limited to welding, and may be joined by bonding with an adhesive or the like.
  • the rubber-coated cord of the present embodiment includes two steel cords, but may be a rubber-coated cord including only one steel cord or a rubber-coated cord including three or more steel cords.
  • the belt 6 of the present embodiment is a rubber-coated belt, but is not limited to this configuration, and the belt 6 is a resin-coated belt formed from a resin-coated cord made of a cord such as a steel cord coated with a coating resin. It is good.
  • the coating resin a resin similar to the resin constituting the resin annular body 5 can be used.
  • the tensile elastic modulus (specified in JIS K7113: 1995) of the coating resin covering the cord is preferably 50 MPa or more. This is because the belt rigidity can be increased. Moreover, it is preferable that the tensile elasticity modulus of coating resin which coat
  • the coating resin here does not include rubber (an organic polymer substance exhibiting rubber elasticity at room temperature).
  • the resin-coated cord can be formed, for example, by coating a molten coating resin on the outer peripheral side of the cord and solidifying by cooling.
  • the use of the resin-coated belt can improve the tire performance such as steering stability while reducing the weight.
  • the cord can be made of, for example, steel monofilament or stranded wire. Moreover, an organic fiber, carbon fiber, or those strands can also be used for a cord.
  • the belt 6 has a configuration in which a rubber-coated cord or a resin-coated cord is spirally wound, but a plurality of belts 6 are arranged in the tire axial direction A and are 10 ° or less with respect to the tire circumferential direction C.
  • the belt 6 is a spiral belt formed in a state where a rubber-coated cord or a resin-coated cord made of a cord 10b coated with a coating rubber 10a or a coating resin is spirally wound as in the present embodiment. It is preferable that In this way, since the circumferential belt 6a can be formed by the continuous cord 10b having no joint portion in the tire circumferential direction C, the rigidity of the tire 1 in the tire circumferential direction C can be further increased.
  • the tread rubber 7 constitutes an outer surface of the tread portion 1a in the tire radial direction B (hereinafter referred to as “tread outer surface”), and the tread outer surface of the present embodiment has a tire circumferential direction C (see FIG. A tread pattern including a circumferential groove 7a extending in the tire axial direction A and a widthwise groove (not shown) extending in the tire axial direction A is formed.
  • the side rubber 8 constitutes an outer surface of the sidewall portion 1b in the tire axial direction A, and is formed integrally with the tread rubber 7 described above.
  • the inner liner 9 is laminated on the inner surface of the carcass 4 and is formed of butyl rubber having low air permeability in the present embodiment.
  • the butyl rubber means butyl rubber and halogenated butyl rubber which is a derivative thereof.
  • the resin annular body 5 of the present embodiment is composed of a first annular portion 5a and a second annular portion 5b. That is, both end portions in the tire axial direction A of the resin annular body 5 of the present embodiment are configured by the first annular portion 5a or the second annular portion 5b. Further, the joint between the annular end surface 11 of the first annular portion 5 a and the annular end surface 12 of the second annular portion 5 b is formed at a position in the tire axial direction A where the outer diameter of the tire 1 is maximum. As shown in FIG. 1, both ends of the resin annular body 5 in the tire axial direction A are located outside the tread end TE in the tire axial direction A. In other words, the resin annular body 5 extends to the outside in the tire axial direction A from the tread end TE.
  • the end portion on the other side in the tire axial direction A of the first annular portion 5 a (in the present embodiment, the annular end surface 11 in the tire axial direction A is The end portion on the opposite side to a certain side) is a reduced diameter portion 13 that decreases in diameter so as to approach the tire center axis O toward the outer end in the tire axial direction A.
  • there is an end portion on one side of the second annular portion 5b in the tire axial direction A in the present embodiment, there is an annular end surface 12 in the tire axial direction A).
  • the end portion on the opposite side to the side) is a reduced diameter portion 14 that decreases in diameter so as to approach the tire center axis O toward the outer end in the tire axial direction.
  • both end portions in the tire axial direction A of the resin annular body 5 of the present embodiment are constituted by the reduced diameter portions 13 and 14 that are reduced in diameter so as to approach the tire center axis O toward the outer end in the tire axial direction A. ing.
  • the tread end TE (see FIG. 1) is compared with the case where the reduced diameter portions 13 and 14 are not provided and the resin annular body has a uniform inner diameter and outer diameter. It is possible to suppress the local contact pressure from locally increasing at a position in the vicinity, and to suppress the occurrence of uneven wear on the outer surface of the tread.
  • the reduced diameter portions 13 and 14 are reduced in diameter so as to substantially follow the carcass 4 in a cross-sectional view along the tire axial direction A.
  • the outer surface in the tire radial direction B of the resin annular body 5 of the present embodiment is a barrel shape, and the outer surfaces of the reduced diameter portions 13 and 14 of the present embodiment are convex shapes. It is a curved surface that bends in a straight line.
  • the outer surfaces of the diameter-reduced portions 13 and 14 in the tire radial direction B convex curved surfaces, local fluctuations in the contact pressure are caused at positions near the tread end TE (see FIG. 1). Can be suppressed more.
  • the annular end surface 11 of the first annular portion 5 a and the annular end surface 12 of the second annular portion 5 b of the resin annular body 5 are connected to the tire shaft of the resin annular body 5.
  • the inclined surface is inclined with respect to the tire axial direction A and the tire radial direction B.
  • the inclination angle ⁇ 1 of the annular end surface 11 of the first annular portion 5a with respect to the tire axial direction A is preferably close to 0 ° along the tire axial direction A from the viewpoint of expanding the joint surface. . Therefore, the inclination angle ⁇ 1 of the annular end surface 11 of the first annular portion 5a with respect to the tire axial direction A is preferably 45 ° or less, and more preferably 30 ° or less. The same applies to the inclination angle ⁇ 2 of the annular end surface 12 of the second annular portion 5b with respect to the tire axial direction A.
  • the entire region of the annular end surface 11 of the first annular portion 5 a of the present embodiment is in a position overlapping with the entire region of the second annular portion 5 b in the tire axial direction A. That is, the annular end surfaces 11 and 12 are not exposed on the inner surface side and the outer surface side in the tire radial direction B of the resin annular body 5. And the 1st annular part 5a and the 2nd annular part 5b are joined by welding between the annular end surface 11 of the 1st annular part 5a, and the annular end surface 12 of the 2nd annular part 5b. As described above, the annular end surfaces 11 and 12 are configured to include the inclined surface, whereby a large joint surface can be secured.
  • annular end surfaces 11 and 12 of this embodiment are comprised only by the inclined surface inclined with respect to the tire axial direction A, in addition to an inclined surface, the surface etc. extended in parallel with the tire radial direction B etc.
  • An annular end face may be included.
  • the first annular portion 5a of the present embodiment has a substantially uniform thickness at positions excluding the position of the annular end surface 11.
  • the thickness of the first annular portion 5a of the present embodiment is set from a range of 0.3 mm to 1.0 mm, for example.
  • the second annular portion 5b of the present embodiment also has a substantially uniform thickness at positions other than the position of the annular end surface 12.
  • the thickness of the 2nd annular part 5b of this embodiment is set as the thickness substantially equal to the 1st annular part 5a.
  • FIG. 5 is a view showing a modification of the annular end faces 11 and 12 shown in FIG.
  • An annular end surface 111 of the first annular portion 5a illustrated in FIG. 5 includes an inclined surface that is inclined with respect to the tire axial direction A in the tire axial direction sectional view that is a sectional view along the tire axial direction A.
  • the annular end surface 111 of the first annular portion 5a shown in FIG. 5 has a first inclined surface 120a that is inclined with respect to the tire axial direction A and a tire axial direction A in the tire axial sectional view.
  • the first inclined surface 120a and the second inclined surface 120b form a top portion 121 of the annular end surface 111 by ridgelines intersecting each other.
  • annular end surface 112 of the second annular portion 5b shown in FIG. 5 includes an inclined surface that is inclined with respect to the tire axial direction A in the tire axial direction sectional view that is a sectional view along the tire axial direction A.
  • the annular end surface 112 of the second annular portion 5b shown in FIG. 5 has a first inclined surface 122a that is inclined with respect to the tire axial direction A and a tire axial direction A in the tire axial sectional view.
  • the first inclined surface 122a and the second inclined surface 122b form a top portion 123 of the annular end surface 112 by ridge lines intersecting each other.
  • the first inclined surface 120a of the annular end surface 111 of the first annular portion 5a is disposed to face the second inclined surface 122b of the annular end surface 112 of the second annular portion 5b so as to overlap in the tire radial direction B.
  • the first inclined surface 120a of the annular end surface 111 of the first annular portion 5a and the second inclined surface 122b of the annular end surface 112 of the second annular portion 5b are welded.
  • the tire radial direction B of the resin annular body 5 of the junction part of the annular end surfaces 111 and 112 is provided.
  • the bulging portion 125 that melts and bulges when the annular end surface 111 of the first annular portion 5 a and the annular end surface 112 of the second annular portion 5 b are welded can be received in the groove 124.
  • the bulging portion 125 generated by melting the annular end surfaces 111 and 112 becomes the resin ring after welding. Protruding to the outer surface side of the body 5 can be suppressed.
  • the stress concentration of the tire can be further suppressed, and therefore the durability of the tire can be further enhanced.
  • the annular end surface is formed on the inner surface side of the resin annular body 5 at the joint portion of the annular end surfaces 111 and 112.
  • a groove 126 having a V-shaped cross section extending in the tire circumferential direction C and formed by a first inclined surface 120a of 111 and a first inclined surface 122a of the annular end surface 112 is formed. Therefore, the bulging portion 127 that melts and bulges when the annular end surface 111 of the first annular portion 5 a and the annular end surface 112 of the second annular portion 5 b are welded can be received in the groove 126.
  • FIG. 6 is a view showing another modification of the annular end faces 11 and 12 shown in FIG.
  • An annular end surface 211 of the first annular portion 5a shown in FIG. 6 has a joint receiving surface 228 extending along the tire axial direction A of the resin annular body 5 in a cross-sectional view of the resin annular body 5 along the tire axial direction A. Including staircase.
  • annular end surface 211 of the first annular portion 5a shown in FIG. 6 is continuous with the joint receiving surface 228 and one end of the joint receiving surface 228 in the tire axial direction A and extends inward in the tire radial direction B.
  • annular end surface 212 of the second annular portion 5b shown in FIG. 6 is a joint receiving surface that extends along the tire axial direction A of the resin annular body 5 in a cross-sectional view along the tire axial direction A of the resin annular body 5. This is a step surface including H.231.
  • annular end surface 212 of the second annular portion 5b shown in FIG. 6 is continuous with the joint receiving surface 231 and one end of the joint receiving surface 231 in the tire axial direction A and extends outward in the tire radial direction B.
  • a distal end surface 233 that is continuous with the other end in the tire axial direction A of the joint receiving surface 231 and extends inward in the tire radial direction B.
  • the joint receiving surface 228 of the annular end surface 211 of the first annular portion 5a is disposed to face the joint receiving surface 231 of the annular end surface 212 of the second annular portion 5b so as to overlap in the tire radial direction B.
  • the joint receiving surface 228 of the annular end surface 211 of the first annular portion 5a and the joint receiving surface 231 of the annular end surface 212 of the second annular portion 5b are welded together.
  • a gap is formed between the distal end surface 230 of the annular end surface 211 of the first annular portion 5a and the proximal end surface 232 of the annular end surface 212 of the second annular portion 5b.
  • This gap forms a groove 234 having a rectangular cross section that opens to the outer surface side in the tire radial direction B of the resin annular body 5 and extends in the tire circumferential direction C. Therefore, the bulging portion 235 that melts and bulges when the annular end surface 211 of the first annular portion 5a and the annular end surface 212 of the second annular portion 5b are welded can be received in the groove 234.
  • a gap is formed between the base end surface 229 of the annular end surface 211 of the first annular portion 5a and the distal end surface 233 of the annular end surface 212 of the second annular portion 5b.
  • This gap constitutes a rectangular cross-sectional groove 236 that opens to the inner surface side of the resin annular body 5 and extends in the tire circumferential direction C. Therefore, the bulging portion 237 that melts and bulges when the annular end surface 211 of the first annular portion 5a and the annular end surface 212 of the second annular portion 5b are welded can be received in the groove 236.
  • FIG. 7A and 7B are perspective views showing modifications of the resin annular body 5.
  • FIG. 7A is a diagram illustrating a resin annular body 305 as a modification of the resin annular body 5.
  • FIG. 7B is a view showing a resin annular body 405 as a modified example of the resin annular body 5.
  • the resin annular body 305 shown in FIG. 7A and the resin annular body 405 shown in FIG. 7B are formed by forming one strip body in an annular shape and joining the end faces to each other as compared with the resin annular body 5 shown in FIGS. It differs in that it is formed.
  • the resin annular body 305 shown in FIG. 7A is formed by joining one end face 339 and the other end face 340 in the longitudinal direction of a resin strip 338. That is, the longitudinal direction of the strip body 338 is the same direction as the tire circumferential direction C.
  • At least a part of one end surface 339 of the strip body 338 and the other end surface 340 of the strip body 338 are arranged so as to overlap in the tire radial direction B. In the present embodiment, at least a part of one end surface 339 of the strip body 338 and the other end surface 340 of the strip body 338 are arranged so as to overlap in the thickness direction of the strip body 338.
  • FIG. 8 is a cross-sectional view showing a cross section of the resin annular body 305 shown in FIG. 7A perpendicular to the tire axial direction A (the same direction as the tire width direction) of the strip body 338.
  • the inner end edge 339a in the tire radial direction B of one end surface 339 of the strip body 338 is more in the tire radial direction than the outer end edge 340b in the tire radial direction B of the other end surface 340 of the strip body 338.
  • outer end edge 339b in the tire radial direction B of one end surface 339 of the strip body 338 is located outside the inner end edge 340a in the tire radial direction B of the other end surface 340 of the strip body 338 in the outer side in the tire radial direction B. To do.
  • the resin annular body 305 can be formed with one member, and the same effect can be obtained.
  • the resin annular body 405 shown in FIG. 7B is different in the configuration of the joint portion from the resin annular body 305 shown in FIG. 7A, but the other configurations are the same. Specifically, one end surface 339 and the other end surface 340 of the resin annular body 305 shown in FIG. 7A extend along the tire axial direction A, whereas the strip body of the resin annular body 405 shown in FIG. 7B. One end surface 439 and the other end surface 440 of 438 extend inclined with respect to the tire axial direction A when the resin annular body 405 is viewed from the outside in the tire radial direction B. By setting it as such a structure, durability of a tire can be improved more.
  • both end portions in the tire axial direction A of the resin annular body 305 shown in FIG. 7A are constituted by reduced diameter portions 313 and 314.
  • the outer surface in the tire radial direction of each of the reduced diameter portions 313 and 314 is a curved surface that curves into a convex shape.
  • both end portions in the tire axial direction A of the resin annular body 405 shown in FIG. 7B are constituted by reduced diameter portions 413 and 414.
  • the outer surface in the tire radial direction B of each of the reduced diameter portions 413 and 414 is a curved surface that curves into a convex shape.
  • the end face 339 and the other end face 340 can be adopted as shapes in a cross-sectional view (see FIG. 8) perpendicular to the tire axial direction A (the same direction as the tire width direction) of the strip body 338, and the same effect can be obtained. Can do.
  • the end face 439 and the other end face 440 can be adopted as shapes in a cross-sectional view orthogonal to the tire axial direction A (the same direction as the tire width direction) of the strip body 438, and similar effects can be obtained.
  • the pneumatic tire according to the present invention is not limited to the specific configurations shown in the above-described embodiments and modifications, and various modifications and changes can be made without departing from the scope of the claims.
  • the resin annular body shown in FIGS. 1 to 7 has a barrel-shaped outer shape, but there are reduced diameter portions only at both ends in the tire axial direction A, and the central portion in the tire axial direction A has an inner diameter and It is good also as a resin annular body comprised by the cylinder part with a uniform outer diameter.
  • the present invention relates to a pneumatic tire.
  • 1 pneumatic tire, 1a: tread portion, 1b: sidewall portion, 1c: bead portion, 3: bead member, 3a: bead core, 3b: bead filler, 4: carcass, 4a: carcass ply, 5, 305, 405: Resin annular body, 5a: first annular portion, 5b: second annular portion, 6: belt, 6a: circumferential belt, 7: tread rubber, 7a: circumferential groove, 8: side rubber, 9: inner liner, 10a: Covered rubber, 10b: cord, 11, 111, 211: annular end surface of the first annular portion, 11a: inner edge of the annular end surface of the first annular portion, 11b: outer edge of the annular end surface of the first annular portion, 12 112a, 212: the annular end surface of the second annular portion, 12a: the inner edge of the annular end surface of the second annular portion, and 12b: the outer end of the annular end surface of the second annular portion

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  • Engineering & Computer Science (AREA)
  • Mechanical Engineering (AREA)
  • Tires In General (AREA)

Abstract

La présente invention concerne un bandage pneumatique comprenant une portion de bande de roulement pourvue : d'un corps annulaire en résine formé d'une surface d'extrémité annulaire sur un côté dans la direction d'un axe de bandage d'une première portion annulaire en résine et d'une surface d'extrémité annulaire sur l'autre côté dans la direction de l'axe de bandage d'une deuxième portion annulaire en résine qui sont jointes l'une à l'autre ; et une ceinture qui est disposée sur l'extérieur dans une direction radiale de bandage du corps annulaire en résine, et comprend un câble recouvert de caoutchouc ou de résine. La surface d'extrémité annulaire de la première portion annulaire du corps annulaire en résine et la surface d'extrémité annulaire de la deuxième portion annulaire du corps annulaire en résine sont disposées de manière à se chevaucher au moins partiellement dans la direction radiale du bandage.
PCT/JP2019/021236 2018-05-31 2019-05-29 Bandage pneumatique WO2019230771A1 (fr)

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
JP2018-105499 2018-05-31
JP2018105499A JP2019209751A (ja) 2018-05-31 2018-05-31 空気入りタイヤ

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WO2019230771A1 true WO2019230771A1 (fr) 2019-12-05

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WO (1) WO2019230771A1 (fr)

Citations (5)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JPS63212104A (ja) * 1987-02-25 1988-09-05 Sumitomo Rubber Ind Ltd 空気入りタイヤ
JPH03143701A (ja) * 1989-10-27 1991-06-19 Sumitomo Rubber Ind Ltd 空気入りタイヤ
JPH05116504A (ja) * 1991-04-15 1993-05-14 Sumitomo Rubber Ind Ltd 空気入りタイヤ
WO2009110353A1 (fr) * 2008-03-07 2009-09-11 横浜ゴム株式会社 Pneu et son procédé de fabrication
JP2014097800A (ja) * 2009-02-17 2014-05-29 Bridgestone Corp タイヤ、及びタイヤの製造方法

Patent Citations (5)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JPS63212104A (ja) * 1987-02-25 1988-09-05 Sumitomo Rubber Ind Ltd 空気入りタイヤ
JPH03143701A (ja) * 1989-10-27 1991-06-19 Sumitomo Rubber Ind Ltd 空気入りタイヤ
JPH05116504A (ja) * 1991-04-15 1993-05-14 Sumitomo Rubber Ind Ltd 空気入りタイヤ
WO2009110353A1 (fr) * 2008-03-07 2009-09-11 横浜ゴム株式会社 Pneu et son procédé de fabrication
JP2014097800A (ja) * 2009-02-17 2014-05-29 Bridgestone Corp タイヤ、及びタイヤの製造方法

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